def build_profile(first, last, **user_info):
     profile = {}
     profile['first_name'] = first
     profile['last_name'] = last
     for key, value in user_info.items():
         profile[key] = value
     return profile
user_profile = build_profile('yuanzhen', 'luo',location='chengdu',population='7',friend='wangxue')
print(user_profile)